60 lines
1.2 KiB
Go
60 lines
1.2 KiB
Go
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package mount
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/*
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/_iovec.h>
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#include <sys/mount.h>
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#include <sys/param.h>
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*/
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import "C"
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import (
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"fmt"
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"strings"
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"syscall"
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"unsafe"
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)
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func allocateIOVecs(options []string) []C.struct_iovec {
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out := make([]C.struct_iovec, len(options))
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for i, option := range options {
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out[i].iov_base = unsafe.Pointer(C.CString(option))
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out[i].iov_len = C.size_t(len(option) + 1)
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}
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return out
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}
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func mount(device, target, mType string, flag uintptr, data string) error {
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isNullFS := false
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xs := strings.Split(data, ",")
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for _, x := range xs {
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if x == "bind" {
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isNullFS = true
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}
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}
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options := []string{"fspath", target}
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if isNullFS {
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options = append(options, "fstype", "nullfs", "target", device)
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} else {
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options = append(options, "fstype", mType, "from", device)
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}
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rawOptions := allocateIOVecs(options)
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for _, rawOption := range rawOptions {
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defer C.free(rawOption.iov_base)
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}
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if errno := C.nmount(&rawOptions[0], C.uint(len(options)), C.int(flag)); errno != 0 {
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reason := C.GoString(C.strerror(*C.__error()))
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return fmt.Errorf("Failed to call nmount: %s", reason)
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}
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return nil
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}
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func unmount(target string, flag int) error {
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return syscall.Unmount(target, flag)
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}
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